PO output not to default vendor master

Hi experts,

We run SRM5.0/Server5.5 in extended classic scenario.

We changed SC create with customer fields, where the employee can manually enter the e-mail or fax address as this information is usually not up-to-date in vendor master data.

The information is passed on to the purchase order, but when we process the output the SAP standard output programm still is going to the vendor master data and picks the e-mail or fax address there instead of using the document specific data.

Does anyone of you know how we could solve the requirement? We want to change the SAP standard programm that should pick the e-mail or fax from the PO-document and not from the vendor master.

Many thanks for any suggestions.

Regards,

Corinne